Edit: to the whole question please. This for a java lab, the book referenced in

Question

Edit: to the whole question please.

This for a java lab, the book referenced in the question is, getting started with java 6th edition, I have been unable to obtain the book, if anyone can help me with this, I would be very grateful, thank you!

2. Using MathTutor.java on page 250 make the following changes a. Do a random selection on the operation to perform. You can do this by running a generator with only 4 numbers and using a switch to pick your operator. b. Keep count of right and wrong answers and display the running totals c. "Emcompass" program in a loop to continue the game.

Explanation / Answer

I googled a lot to get a pdf copy of the book, but it seems that the book is not available onlline. Without MathTutor.java file, it becomes difficult for any expert to answer your question. But I understand your position, hence, for the tme being, I can provide you a sample code which covers all the requirements. Once you provide the MathTutor.java file, I can update my code too.

CODE

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import java.util.Random;

public class tester {

   public static void main(String[] args) {

       Random rand = new Random();

       int right = 0, wrong = 0;

       while(true) {

           int operation = rand.nextInt(4);

           switch(operation) {

           case 0:

               // do the first operation here

               // if answer is correct, then do right ++

               // else do wrong ++;

               System.out.println("Right answers = " + right + ", wrong answers = " + wrong);

               break;

           case 1:

               // do the second operation here

               // if answer is correct, then do right ++

               // else do wrong ++;

               System.out.println("Right answers = " + right + ", wrong answers = " + wrong);

               break;

           case 2:

               // do the third operation here

               // if answer is correct, then do right ++

               // else do wrong ++;

               System.out.println("Right answers = " + right + ", wrong answers = " + wrong);

               break;

           case 3:

               // do the fourth operation here

               // if answer is correct, then do right ++

               // else do wrong ++;

               System.out.println("Right answers = " + right + ", wrong answers = " + wrong);

               break;

           default:

               System.out.println("Wrong input!!");

               break;

           }

       }

   }

}

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